4 Pa. Code § 1.872
The following words and phrases when used in this subchapter have, unless otherwise defined by Commonwealth State law or the context clearly indicates otherwise, or both, the following meanings given:
Gender expression-The external manifestations of gender, expressed through a person's name, pronouns, clothing, haircut, behavior, voice and/or body characteristics.
Gender identity-A person's internal, deeply held sense of their gender, regardless of their biological sex and/or the sex they were assigned at birth.
Protected labor activities-Labor activities protected under the Public Employe Relations Act (43 P.S. § § 1101.101-1101.2301), Pennsylvania Labor Relations Act (43 P.S. § § 211.1-211.13) or National Labor Relations Act (29 U.S.C.A. § § 151-169), as applicable and to the extent determined by entities charged with these acts' enforcement.
Sexual orientation-An individual's enduring physical, romantic and/or emotional attraction to members of the same or opposite sex, including lesbian, gay, bisexual and heterosexual (straight) orientations, or lack thereof, including asexual orientation.
4 Pa. Code § 1.872